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1.04199

Sigma-Aldrich

Methyl blue (C.I. 42780)

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About This Item

Empirical Formula (Hill Notation):
C37H27N3Na2O9S3
CAS Number:
28983-56-4
Molecular Weight:
799.80
MDL number:
MFCD00058509

form

solid

Quality Level

200

potency

>5000 mg/kg LD50, oral (Rat)

composition

Dye, ≥60% spectrophotometric assay

pH

5.0 (20 °C, 10 g/L in H2O)

solubility

70 g/L

bulk density

670 kg/m3

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

2-30°C

InChI

1S/C37H29N3O9S3.2Na/c41-50(42,43)34-10-4-1-7-31(34)38-28-19-13-25(14-20-28)37(26-15-21-29(22-16-26)39-32-8-2-5-11-35(32)51(44,45)46)27-17-23-30(24-18-27)40-33-9-3-6-12-36(33)52(47,48)49;;/h1-24,38-39H,(H,41,42,43)(H,44,45,46)(H,47,48,49);;/q;2*+1/p-3

InChI key

TUHAIJABPUJAEY-UHFFFAOYSA-K

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General description

Methyl blue (C.I.42780), is a dry dye for the preparation of a color staining solution used for the polychrome staining of histological tissue sections of human origin. The dye has a constant dye content and a reliable high quality, which is one of the major precondition for a reproducible diagnostic staining.

Application

for microscopy

Analysis Note

Dye content (spectrophotometrically): ≥ 60 %
Identity
- sodium:
passes test
- UV/VIS-Spectrum: passes test
Absorption maximum λ max (Hydrochloric acid 0.005 mol/l): 595 - 605 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.01 g/l; hydrochloric acid 0.005 mol/l): 675 - 1125
TLC-Test: passes test
Loss on drying (110 °C): ≤ 7 %
Suitability for microscopy: passes test

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 2

flash_point_f

572.0 °F - Pensky-Martens closed cup

flash_point_c

> 300 °C - Pensky-Martens closed cup

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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